Send on behalf of shared mailbox

To send an email on behalf of a shared mailbox, you'll need to use the SendOnBehalfOf parameter in the Send-MailMessage cmdlet in PowerShell. Here's an example:

$sharedMailbox = "[email protected]"
$fromAddress = "[email protected]"
$subject = "Test email sent on behalf of shared mailbox"
$body = "This is a test email sent on behalf of the shared mailbox."

Send-MailMessage -To "[email protected]" -From $fromAddress -Subject $subject -Body $body -SmtpServer "smtp.example.com" -UseSsl -Credential (Get-Credential $sharedMailbox) -SendOnBehalfOf $sharedMailbox

In this example, replace:

• $sharedMailbox with the email address of the shared mailbox you want to send the email on behalf of.
• $fromAddress with your own email address.
• [email protected] with the email address of the recipient you want to send the email to.
• smtp.example.com with the SMTP server you want to use to send the email.
• [email protected] with your own email address.

Make sure to replace the placeholders with the actual values and run the command in PowerShell.

Note: You need to have the necessary permissions to send emails on behalf of the shared mailbox. Also, the Get-Credential cmdlet is used to prompt you for the credentials of the shared mailbox. You can also hardcode the credentials if you have them.

Also, you can use the Send-MailMessage cmdlet in Exchange PowerShell, it's more powerful and flexible than the one in Windows PowerShell.

$sharedMailbox = "[email protected]"
$fromAddress = "[email protected]"
$subject = "Test email sent on behalf of shared mailbox"
$body = "This is a test email sent on behalf of the shared mailbox."

Send-MailMessage -To "[email protected]" -From $fromAddress -Subject $subject -Body $body -SmtpServer "smtp.example.com" -UseSsl -Credential (Get-Credential $sharedMailbox) -SendOnBehalfOf $sharedMailbox -UseActAs

The -UseActAs parameter is used to specify that the email should be sent on behalf of the shared mailbox.